Getting a 404 on /wd/hub/session when I try to connect to selenium grid remotely via Python

Asked 26/6, 2012 at 13:11 Answered 16/1, 2013 at 20:59

python selenium selenium-webdriver selenium-grid

I can see two remotes under the console but when I try to connect remotely and execute something it fails with a 404.

from selenium import webdriver
browser = webdriver.Remote(
   command_executor='http://ec2-184-72-129-183.compute-1.amazonaws.com:4444/wd/hub',
   desired_capabilities={'browserName': 'firefox'})
browser.get('http://www.google.com')
browser.quit()

Throws this exception

Traceback (most recent call last):
  File "browser-shot.py", line 16, in <module>
    desired_capabilities={'browserName': 'firefox'})
  File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 62, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 104, in start_session
    'desiredCapabilities': desired_capabilities,
  File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 155, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/errorhandler.py", line 125, in check_response
    raise exception_class(value)
selenium.common.exceptions.WebDriverException: Message: '<html>\n<head>\n<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>\n<title>Error 404 </title>\n</head>\n<body><h2>HTTP ERROR: 404</h2><pre>NOT_FOUND</pre>\n<p>RequestURI=/wd/hub/session</p><p><i><small><a href="http://jetty.mortbay.org/">Powered by Jetty://</a></small></i></p><br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n\n</body>\n</html>\n'

Blueberry answered 26/6, 2012 at 13:11 Comment(3)

I have a similar problem. It seems either /wd/hub/session isn't being served by selenium or the Remote is looking for a resource in the wrong place. – Structural 9/1, 2013 at 22:4

Its a shot in the dark, since i'm not familiar with Python bindings, but this could be connection related, i have several problems where i could connect to the grid via IDE but wasn't possible on Hudson/Jenkins. – Oilbird 15/1, 2013 at 19:28

I recomend you to remove the aws url from the example... you know, just in case :) – Phreno 16/1, 2013 at 21:1

This doesn't appear to be a python error. It seems like the machine you have your selenium server on is refusing requests. In the error message, you have an <a href="http://jetty.mortbay.org/">Powered by Jetty://</a> which got me thinking that it is somehow related to Jetty.

I don't know much about Jetty, but you might want to look there for your answers. One possible problem is that Jetty is also running on port 4444, but I can't say for sure, because I don't know how Jetty works.

EDIT

I should also add that I tried your setup on my local machine, to one of my servers (that doesn't have Jetty on it) and it worked perfectly fine.

Manzanares answered 16/1, 2013 at 18:50 Comment(6)

I think Jetty is the webserver that selenium grid runs on top of. If Jetty were running as a separate process there, wouldn't either Jetty or the grid throw a binding error when starting, saying the port is in use? – Structural 16/1, 2013 at 18:56

Wait, are you using the standalone server for selenium? – Manzanares 16/1, 2013 at 21:28

Also, can you post your selenium version? – Manzanares 16/1, 2013 at 21:35

I'm using selenium grid 1.0.8. I'm starting the grid with ant launch-hub – Structural 16/1, 2013 at 22:58

Could you try to use the standalone server that is here: selenium.googlecode.com/files/… – Manzanares 17/1, 2013 at 0:53

that was it. "I'll change this to use a port that nobody uses ... like 4444." oops. – Gaius 23/5, 2017 at 23:16

Try running selenium hub using_

-port 5555

And then configure clients with also:

-port 5555

I think is an issue with another software using port 4444 or selenium is not starting in that port correctly.

Phreno answered 16/1, 2013 at 20:59 Comment(0)

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